Everyone's experience will vary with the SR lines. I've had terrific luck with Screamin', but hubby had to wait a very long time.
See, they felt like the line was backing up, so they had the single riders go into the elevator, go up, walk across the walkway over the tracks, take the other elevator down, and then wait. And wait. And wait.
Meanwhile, NEW single riders were getting in line...and being seated. Before the first big clump of single riders. The seating CM on the normal line side was blatantly ignoring the big group of people in the holding "pen", and was calling for riders from the normal line. Finally someone from the group that had been moved to the other side got the CM's attention and the CM quite grumpily stopped normal loading (once all the "chutes" were empty) by keeping the normal line people on the stairs before the chutes, and let ALL of the single riders on at once. It was SO stupid.
With Toy Story, although we certainly didn't wait the 40 minutes of the normal line, it was a solid wait. They will ask the normal line people if they mind having a stranger with them...that can hold things up a bit. don't get me wrong, I LOVE riding TSMM as a SR, just as much as I LOVE riding Grizzly solo (I've never actually done the SR line at GRR b/c the line hasn't been more than 5 minutes when I've done a solo trip, but they put people altogether anyway).
When I've used the Indy SR line it was pretty brilliant...went in the exit, waited a little bit in the "don't pull this rope" room until the CM let me through, then I was put in the Accessible line which meant I only had to sit through the safety message/newsreel once, then continued along that route. It wasn't 5 minutes (woudln't have been unless I ran), but it was constant moving apart from the "don'nt pull this rope" room.
For the lines, just go up to the CM at the front to get the pass and info on where to go. Soarin' has been the easiest, b/c you go to the FP return CM, and I've never seen a line there. You do have to deal with first-nasty-then-"neener neener" looks from fellow guests, b/c first they think you're pulling one over on them as you pass them by, then they think you've gotten your comeuppance when you're made to wait until a single rider is needed. I just ignore the fellow guests now on Soarin'.